I have heard that Nanna Firko's recipe can also be used to turn Sparrows into Eagles.
Everything the others have said, plus Chicken soup.
Not an old wifes tale, indeed Science. You must boil the bones(carcase) for at least 3.5 hours to produce a certain acid that has now been proven to break up chest Flem. Than remove the bones, grind them to a paste and put them back in.
The Spanish flu in the early 1900's, killed way more victims than both world wars combined, way more.
One of my grandfathers had a fire going all the time. He boiled the frame and carcase of every fish and animal he murdered for stock, then ground their softened bones to a paste. Then put them back in or salted them for latter.
I doubt that you, me or and of us will live to the self sufficient age of a 104 that he did near a fishing village in Vancouver.